I think sushi is great. At the very basics it is - rice, vegetables, seaweed and fish (often raw fish).
If you are trying to eat sushi during weight loss, I would suggest avoiding or limiting the following:
The "spicy" sauce in spicy tuna rolls
California rolls (if they are made with crab salad and mayo and not just crab)
"Crunchy/spider" rolls or anything with fried shrimp or fried crab
The sweet sauce on eel rolls
Scallop rolls (made with a creamy sauce)
Ask for all rolls without any mayo
Cream cheese (Philadelphia rolls often have smoked salmon and cream cheese)
Usually, at a sushi place, I order the following:
Sashimi (sliced raw fish, no rice) - I like hamachi (yellowtail tuna) and salmon especially
Seaweed salad
I don't think rice is bad for me, but I don't end to eat a lot of it. I try to limit sushi dinners to 1 roll (6 pieces). If I get nigiri sushi (fish on little rice "pillows") I rarely eat the rice pillows. Some sushi places make sushi with brown rice, which is kinda cool.
I love:
California rolls
Ume rolls - made with pickled plum
Vegetable rolls
Caterpillar rolls - salmon rolls with rice with avocado wrapped around the outside
I ate sushi 2-3 times a week while losing weight, I think it's great! Here's a good
link with more info